A number of interesting opinions. Okay, so the shapeless blob idea is out
I was thinking that an elemental would be big. Ulber or consumer sized. After all, it is a incorporation of a terrifying magical energy. But what is a good shape for an elemental? A swirling midair sphere? A towering cluster of faceted crystals bursting from the ground? A floating giant mask?
I could see it being a high level spell instead of a ring. I just thought more quests would be fun and it would give shadow casters a whole new playground, gathering all the elementals for their ring. (gotta catch them all!)
Learning the spells would work too though, especially if they needed to gather rare and hard to obtain glyphs. OTOH I agree that it shouldn't become part of the playground for hyperstatted chars that is difficult for those of us who aren't. Maybe getting the ring isn't that hard, getting the elemental to stick around is? Perhaps a timer that only allows occasional summoning - after you summon, it's a week till you can again or something. I really don't know.
I'm not sure how a player could fight an elemental either. An elemental is an avatar of a magical way, their material being is almost irrelevant to their existence.
-Cirerey, musing